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Dissolution Kinetics of Nickel Surface Precipitates on Clay Mineral and Oxide Surfaces

^a National Risk Management Research Lab., US EPA, 5995 Center Hill Ave., Cincinnati, OH 45268
^b Dep. of Plant and Soil Sciences, Univ. of Delaware, Newark, DE 19717-1303

View larger version (30K): [in a new window]   Fig. 1. Macroscopic dissolution behavior of aged Ni precipitates on pyrophyllite showing the relative amount of Ni remaining on the surface following extraction with (a) 1 mM EDTA at pH 4.0, (b) HNO3 at pH 6.0, (c) 3 mM oxalate at pH 4.0, and (d) 3 mM acetylacetone at pH 6.0 plotted against the total number of replenishments. The stability of the Ni precipitates increases with aging time

View larger version (30K): [in a new window]   Fig. 2. Macroscopic dissolution behavior of aged Ni precipitates on talc showing the relative amount of Ni remaining on the surface following extraction with (a) 1 mM EDTA at pH 4.0, (b) HNO3 at pH 6.0, (c) 3 mM oxalate at pH 4.0, and (d) 3 mM acetylacetone at pH 6.0 plotted against the total number of replenishments. The stability of the Ni precipitates increases with aging time

View larger version (29K): [in a new window]   Fig. 3. Macroscopic dissolution behavior of aged Ni precipitates on gibbsite showing the relative amount of Ni remaining on the surface following extraction with (a) 1 mM EDTA at pH 4.0, (b) HNO3 at pH 6.0, (c) 3 mM oxalate at pH 4.0, and (d) 3 mM acetylacetone at pH 6.0 plotted against the total number of replenishments. The stability of the Ni precipitates increases with aging time

View larger version (38K): [in a new window]   Fig. 4. Macroscopic dissolution behavior of aged Ni precipitates on silica showing the relative amount of Ni remaining on the surface following extraction with (a) 1 mM EDTA at pH 4.0, (b) 1 mM EDTA at pH 7.5, (c) 3 mM oxalate at pH 4.0, (d) 3 mM acetylacetone at pH 6.0, (e) HNO3 at pH 4.0, and (f) HNO3 at pH 6.0 plotted against the total number of replenishments. The stability of the Ni precipitates increases with aging time

View larger version (27K): [in a new window]   Fig. 5. Macroscopic dissolution behavior of aged Ni precipitates in a gibbsite–silica mixture showing the relative amount of Ni remaining on the mixture surface following extraction with (a) 1 mM EDTA at pH 4.0, (b) HNO3 at pH 6.0, (c) 3 mM oxalate at pH 4.0, and (d) 3 mM acetylacetone at pH 6.0 plotted against the total number of replenishments. The stability of the Ni precipitates increases with aging time